--- Have you solved your problem?---I've kept on thinking about that matter ______, but I have no idea yet now.
— ____ is it from your home to the subway station? —About two kilometers.
Our music teacher is a beautiful girl. She is like a sister _____us.
There is a very big river _____ their school _____ the village.
It’s easy ________ chess.
How long does it take you _____ to work?